CN113084106A

CN113084106A - Casting blank corner heating device and heating method

Info

Publication number: CN113084106A
Application number: CN202110286413.0A
Authority: CN
Inventors: 王强; 何浩; 肖红; 马志民; 蒋晓奇; 廖芸; 李伟红; 胡璐
Original assignee: Zhongke Electric Co ltd
Current assignee: Zhongke Electric Co ltd
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2021-07-09
Anticipated expiration: 2041-03-17
Also published as: CN113084106B

Abstract

The invention provides a casting blank corner heating device and a casting blank corner heating method, wherein the casting blank corner heating device comprises a support, the size of the support is adjustable in the oz direction, K connecting pieces which are hinged with the support and can rotate in a yoz plane are arranged on the support, and K is more than or equal to 1; when K is larger than or equal to 2, K connecting pieces are arranged at intervals along the ox direction; the ith connecting piece is connected with the ith heating unit used for heating the casting blank edges and corners on the ith continuous casting line, and the ith connecting piece drives the ith heating unit to rotate in the yoz plane.

Description

Casting blank corner heating device and heating method

Technical Field

The invention belongs to the technical field of continuous casting metallurgy, and particularly relates to an online multi-specification casting blank corner heating device and a casting blank corner heating method.

Background

With the development of the technology, the continuous casting metallurgy technology is greatly improved. However, with the progress of industrial technology and the market demand, higher requirements are made on the quality of steel. Due to the two-dimensional cooling heat transfer effect of the edge part, the temperature drop speed of the edge part of the casting blank is obviously higher than the temperature drop speed of the middle part of the casting blank, and generally, the temperature difference between the edge part and the middle part of the casting blank can reach more than 150 ℃, so that the actual temperature of the casting blank entering a withdrawal and straightening machine can be lower than 800 ℃. The edges and corners of the casting blank are separated from the metallurgical phase under a relatively supercooled state, and the compression reaction is initiated by combining the soft reduction action of the roller row at the upper part of the center line of the casting blank, so that the internal stress is increased. When the temperature of the edge part is too low due to the fact that the cooling strength of the edge part of the casting blank is too high, nitrides formed by micro-alloy elements such as Nb, Cr and Al are easy to precipitate on crystals, the casting blank is cooled to a high-temperature low-plasticity zone, and then fine cracks are formed at the grain boundary and the edge part of the casting blank.

When the temperature of the corner part is reduced to the brittle temperature (generally 700 ℃ C. and 900 ℃ C.), the plasticity of the casting blank is seriously influenced. In the casting blank withdrawal and straightening process, because the temperature of the edge part of the casting blank is too low, stress concentration is generated at the fine crack part, the edge part crack is further developed, and finally, the edge part of the casting blank generates transverse cracks, so that the quality and yield of steel are reduced, and the production cost is improved.

Aiming at the generation mechanism of the edge cracks and the corner cracks of the casting blank, the effective control method is that the edge parts are heated before the casting blank enters the horizontal section, so that when the casting blank enters the straightening section, the temperatures of the edge parts and the middle part of the casting blank avoid a brittle temperature area and rise to 1100-1150 ℃ without causing decarburization and increasing quenching property, and the edge cracks of the casting blank are improved or avoided.

The current common heating modes mainly comprise gas heating and electromagnetic induction heating. However, the position of the heating device at the corner of the casting blank cannot be adjusted according to the position and the running direction of the heated casting blank, so that the distance between the heating system and the casting blank is too large, and the required heating effect cannot be achieved.

Disclosure of Invention

Aiming at the problem that the position of a casting blank corner heating device cannot be adjusted according to the position and the running direction of a heated casting blank in the prior art, the invention provides a casting blank corner heating device and a casting blank corner heating method.

In order to solve the technical problems, the invention adopts the technical scheme that: a casting blank corner heating device defines an orthogonal Cartesian coordinate system (x, y, z) at any position of the casting blank corner heating device, the origin of the coordinate system is o, the oz direction is the height direction of the casting blank corner heating device, and the yoz plane is parallel to the running direction of a casting blank;

the casting blank corner heating device comprises a support, the size of the support is adjustable in the oz direction, K connecting pieces which are hinged with the support and can rotate in a yoz plane are arranged on the support, and K is more than or equal to 1;

when K is larger than or equal to 2, K connecting pieces are arranged at intervals along the ox direction;

the ith connecting piece is connected with the ith heating unit used for heating the casting blank edges and corners on the ith continuous casting line, and the ith connecting piece drives the ith heating unit to rotate in the yoz plane, i =1,2, … and K.

In this application, because the support is adjustable in size and the connecting piece is rotatable in the oz direction, thereby can be according to the casting blank traffic direction adjustment ith heating unit on the ith flow continuous casting line the turned angle and the high position in the oz direction, thereby make ith heating unit be close to the casting blank on the ith flow continuous casting line and adjust required angle, and adjust the clearance between heating unit and the casting blank to appropriate value, avoid causing the energy extravagant because of the great and problem that increases steel cost in clearance between casting blank and the device, thereby realize better heating effect.

Furthermore, the bracket comprises a first telescopic structure with adjustable size in the oz direction, a second telescopic structure with adjustable size in the ox direction is arranged on a movable part of the first telescopic structure, and K connecting pieces are arranged on the movable part of the second telescopic structure and hinged with the movable part of the second telescopic structure;

preferably, the first telescopic structure comprises a base, the movable part of the first telescopic structure is a movable support which is arranged above the base and is sleeved with the base, the first telescopic structure further comprises a telescopic adjusting mechanism with adjustable size in the oz direction, and two ends of the telescopic adjusting mechanism are respectively and correspondingly and fixedly connected with the base and the movable support;

preferably, the movable support is provided with a limiting structure for preventing the second telescopic structure from swinging when the second telescopic structure is telescopic along the ox direction.

In this application, through setting up second extending structure to can adjust the heating element position in ox direction, be convenient for heat the casting blank. Moreover, when the heating device breaks down and cannot meet the heating requirement, the continuous casting machine does not need to be stopped, and the casting blank corner heating device can be separated from the continuous casting system and is convenient to disassemble and maintain only by adjusting the first telescopic structure and the second telescopic structure.

Further, the ith heating unit comprises an ith first hinge shaft and an ith third telescopic structure, and the ith connecting piece can rotate around the ith first hinge shaft in a yoz plane.

The first rotating portion and the second rotating portion are sleeved on the ith first hinge shaft and respectively correspond to and are fixedly connected with the movable portion and the ith connecting piece of the second telescopic structure, two ends of the ith third telescopic structure are respectively hinged with the movable portion and the ith connecting piece of the second telescopic structure, and the projection of the pin joint of the ith third telescopic structure and the movable portion of the second telescopic structure, the pin joint of the ith third telescopic structure and the ith connecting piece and the projection of the axis of the ith first hinge shaft on the yoz plane form a triangle.

In this application, the distance between the pin joint of the activity portion of ith first articulated shaft axis, ith third extending structure and second extending structure is fixed, ith first articulated shaft axis, distance between the pin joint of ith third extending structure and ith connecting piece is fixed, can be through the adjustment to the flexible length of third extending structure, only change the size on a triangle-shaped's limit promptly, can realize the adjustment of the turned angle of ith connecting piece, moreover, the steam generator is simple in structure, and the space is saved in the adjustment of being convenient for.

Further, the ith heating unit comprises M_iAn inductor;

M_ieach sensor can slide along the direction parallel to the ox direction to be connected with the ith connecting piece in a sliding way, or M_iThe sensor is fixedly connected with the ith connecting piece;

the inductor has a non-magnetic housing, and the non-magnetic housing of the inductor of the ith heating unit has N_iA turning part, M_i≥1，N_iMore than or equal to 1, two wall surfaces of the nonmagnetic shell forming the opening of the turning part are respectively a first wall surface and a second wall surface of the turning part; the included angle of the turning part is [45 degrees ], 135 degrees DEG]；

The non-magnetic shell inner cavity is provided with an L-shaped coil winding corresponding to the position of each turning part;

the L-shaped coil winding comprises a first coil substructure with R1 layers and a second coil substructure with R2 layers, wherein the first coil substructure with R1 layers and the second coil substructure with R2 layers form the L-shaped coil winding integrally, R1 is more than or equal to 1, and R2 is more than or equal to 1;

in the L-shaped coil winding, the coil planes of the first coil sub-structures of each layer are parallel to each other and are parallel to the first plane of the L-shaped coil winding, and the coil planes of the second coil sub-structures of each layer are parallel to each other and are parallel to the second plane of the L-shaped coil winding;

when the L-shaped coil winding is electrified, the connecting line of the two magnetic poles formed by each layer of the first coil substructure is vertical to the first plane, and the N pole is positioned at the same side corresponding to the S pole;

the first plane and the second plane of the L-shaped coil winding are respectively parallel to the first wall surface and the second wall surface of the corresponding turning part, the L-shaped coil winding is arranged along the turning direction of the corresponding turning part, and the direction of the opening of the L-shaped coil winding is the same as the direction of the opening of the corresponding turning part;

an ith third plane exists, so that the first plane and the second plane of each L-shaped coil winding in the ith heating unit are perpendicular to the ith third plane;

defining an ith first direction as a direction perpendicular to an ith third plane, and defining an ith second direction parallel to the ith third plane and perpendicularly intersecting with the ox direction;

M_im of a sensor_i×N_iThe i-th accommodation region, M, is formed between the turning parts_i×N_iThe turning part openings face the ith accommodating area,

the projection shape of the ith accommodating region on the ith third plane is M_i×N_iThe end points are polygonal and have the same cross section shape as the casting billet on the ith casting line, the projection area of the ith containing area on the ith third plane is not less than the cross section area of the casting billet on the ith casting line, M_iThe projection of the intersection line of the first wall surface and the corresponding second wall surface of each turning part of each inductor on the ith third plane forms M of the polygon_i×N_iAn endpoint;

preferably, the angle of the turn is 90 °.

In this application, M_iM of a sensor_i×N_iAn ith accommodating area is formed between the turning parts, when the casting blank on the ith casting line is heated, each turning part wraps the corner part of the casting blank at the position of the corner part of the section of the casting blank, and each L-shaped coil winding is also arranged along the contour of the corner part of the casting blank. The applicant finds that the heating parts of the existing heating device are the central area of the edge part and the area close to the corner part, and the heat is transferred to the corner part by the parts, so that the energy is wasted, and the problem of overburning other parts of the casting blank is caused. According to the invention, the arrangement of the first coil substructure and the second coil substructure forms a required magnetic field, so that the magnetic field can be used for directly heating the corner of the casting blank, and the energy waste is avoided. The turning part is contacted with the edge part of the casting blank or has a certain distance with the edge part of the casting blank.

Furthermore, an iron core is also accommodated in the inner cavity of the non-magnetic shell, the iron core and the wall surface of the non-magnetic shell enclose L-shaped cavities with the same number as the turning parts of the non-magnetic shell, the included angles of the L-shaped cavities and the corresponding turning parts are the same, and the L-shaped cavities are arranged close to the openings of the corresponding turning parts and accommodate corresponding L-shaped coil windings;

preferably, the iron core and the first wall surface and the second wall surface of the turning part enclose an L-shaped cavity corresponding to the turning part.

In this application, through setting up the iron core, can realize better magnetic field effect. Because the iron core and the first wall surface and the second wall surface of the turning part enclose the L-shaped cavity corresponding to the turning part, when the casting blank is heated, the magnetic leakage phenomenon of a magnetic field generated by an L-shaped coil winding is avoided due to the wrapping of the iron core.

the casting blank corner heating device further comprises a control system, an angle measuring device for measuring an included angle between the running direction of the casting blank on the ith casting line and an xoy plane, a speed measuring device for measuring the moving speed of the casting blank on the ith casting line, a position measuring device for measuring the position (or the coordinate) of the casting blank on the ith casting line in a coordinate system (x, y, z), a control part of a first telescopic structure, a control part of a second telescopic structure, a rotation control part of an ith connecting piece are electrically connected with the control system, a position measuring device corresponding to the casting blank on the ith casting line and a speed measuring device are arranged at the position which is d1 away from the entrance of an accommodating area in the ith first direction.

Preferably, openings of two ends of the ith containing area in the ith first direction are respectively an ith containing area inlet and an ith containing area outlet, the casting blank corner heating device further comprises a first pyrometer used for measuring the temperature of the casting blank at the position of the containing area inlet and a second pyrometer used for measuring the temperature of the casting blank at the position of the containing area outlet, and power supply control ends of all the heating units are electrically connected with the control system.

Further, R1= R2, the first R-layer coil substructure and the second R-layer coil substructure are formed by folding an R-th multi-turn spiral coil wound on a plane in half, the first R-layer coil substructure and the second R-layer coil substructure are respectively two parts of the R-th multi-turn spiral coil divided by a folding line, the first R-layer coil substructure and the second R-layer coil substructure constitute an R-th coil unit in an L shape, the R + 1-th L-shaped coil unit is arranged on the side of the R-th L-shaped coil unit far away from the opening, the coil units are sequentially stacked to form the L-shaped coil winding, two adjacent coil units are connected in series, the winding directions of the coil units are the same, and R =1, … … and R1-1; or

Each layer of the first coil substructure and each layer of the second coil substructure are multi-turn spiral coils wound on a plane;

the adjacent two layers of first coil sub-structures are connected in series, the adjacent two layers of second coil sub-structures are connected in series, the winding directions of the first coil sub-structures of all layers are the same, and the winding directions of the second coil sub-structures of all layers are the same; preferably, the R1 layer first coil substructure and the R2 layer second coil substructure are connected in parallel or in series with each other.

In this application, better relative position can be guaranteed to first coil substructure, the r layer second coil substructure that the fifty percent discount formed, if hope to adjust the contained angle of first plane, second plane to certain value, then only need adjust the angle of fifty percent discount, and need not to adjust the position of two coil substructures alone. Moreover, if a plurality of layers are required to be arranged, the r +1 th coil unit of the L shape is arranged on the side, far away from the opening, of the r coil unit of the L shape, so that the coil units are sequentially stacked to form the L-shaped coil winding, the processing is convenient, and better angle precision can be realized.

Further, at least the integer S1 exists, such that M_S1More than or equal to 2, more than or equal to 1, more than or equal to S1, and more than or equal to K, wherein the non-magnetic shell of each inductor of the S1 th heating unit is of an L-shaped structure with 1 turning part(ii) a And/or

At least the integer S2 exists such that M_S2The magnetic field intensity of the magnetic field is more than or equal to 1, S2 is more than or equal to 1 and less than or equal to K, the nonmagnetic shell of each inductor of the S2 heating units is a U-shaped structure with 2 turning parts, the direction of the opening of the U-shaped structure is parallel to the ox direction or the S2 second direction, and the opening of the U-shaped structure forms S2 accommodating areas; and/or

At least the integer S3 exists such that M_S3The number of the non-magnetic shells of the inductors of the S3 heating units is more than or equal to 1 and more than or equal to S3 and more than or equal to K, the non-magnetic shells of the inductors of the S3 heating units are of a zigzag structure with 4 turning parts, and the openings of the zigzag structure form an S3 accommodating area.

Further, two of the sensors of the S1 th heating unit are oppositely arranged in the ox direction, and the S1 th connecting piece is fixedly connected with a guide part extending in a direction parallel to the ox direction, and the two of the sensors are respectively connected with the guide part in a sliding manner;

preferably, the S1 th connecting piece has a base plate, two side plates fixedly arranged on the base plate, the two side plates are oppositely arranged and are parallel to the yoz plane, the casting blank corner heating device further includes two first baffles respectively fixed with two of the inductors, the two first baffles are correspondingly oppositely arranged with the two side plates respectively in the direction parallel to the ox direction, and a fifth telescopic structure capable of being stretched in the direction parallel to the ox direction is arranged between each first baffle and the corresponding side plate; more preferably, N_S1The first wall surfaces of the turning parts are all parallel to the surface of the substrate;

preferably, M_S1=4, of the S1 th heating units, two other inductors are oppositely arranged in the ox direction, and two other inductors are oppositely arranged with the two of the inductors in the S1 th second direction respectively; more preferably, the two other sensors are respectively connected with the guide portion in a sliding manner, or the two other sensors are respectively and correspondingly and fixedly connected with the two sensors, or the two other sensors are respectively and correspondingly connected with the two sensors through two fourth telescopic structures, and the length direction of the fourth telescopic structures is parallel to the S1 th second direction.

This applicationIn the application, the two inductors are respectively connected with the guide part in a sliding manner, so that the distance between the two inductors can be adjusted according to the section size of the casting blank, and the inductors can be in contact with the surface of the casting blank or have a small distance with the surface of the casting blank, thereby realizing a good heating effect. M_S1If =4, the distance between the two other inductors may be adjusted, so that the distance between the two other inductors may be adjusted according to the sectional size of the cast slab.

The invention also provides a casting blank corner heating method using the casting blank corner heating device, which comprises the following steps:

(A) before a casting blank on the ith continuous casting line reaches the inlet of the ith containing area, measuring an included angle between the running direction of the casting blank and an xoy plane, and the coordinate of the casting blank in a coordinate system (x, y, z), and adjusting the size of a bracket in the oz direction and the rotation angle of the ith connecting piece according to the included angle between the running direction of the casting blank and the xoy plane and the coordinate of the casting blank in the coordinate system (x, y, z), so that the projection area of the casting blank on the ith third plane is equal to the section area of the casting blank, and the projection of the casting blank on the ith third plane is not more than the projection range of the ith containing area on the third plane;

(B) heating a casting blank on the ith continuous casting line by using the ith heating unit;

preferably, the step (a) further comprises: measuring the cross-sectional dimension of the cast strand before the strand reaches the inlet of the ith receiving area on the ith continuous casting line, and adjusting M according to the cross-sectional dimension of the cast strand_iThe distance between adjacent ones of the inductors;

preferably, the support comprises a first telescopic structure with adjustable size in the oz direction, a second telescopic structure with adjustable size in the ox direction is arranged on a movable part of the first telescopic structure, and the K connecting pieces are arranged on the movable part of the second telescopic structure and hinged with the movable part of the second telescopic structure; the step (a) further comprises: before a casting blank on the ith continuous casting line reaches the entrance of the ith containing area, adjusting the telescopic length of the second telescopic structure according to the coordinates of the casting blank in a coordinate system (x, y, z);

preferably, the step (B) further comprises: and adjusting the power supply of the ith heating unit according to the target heating temperature of the casting blank on the ith continuous casting line and the temperatures of the casting blank at the inlet position and the outlet position of the ith containing area.

Compared with the prior art, the invention has the beneficial effects that:

1) compared with the traditional gas heating technology, the electromagnetic induction heating technology has the advantages of high heating speed, low energy consumption, high yield, less oxide skin, less environmental pollution, easy control and the like;

2) the heating target is clear, the applicability is strong: because the L-shaped inductor is adopted, the L-shaped coil winding is distributed along the edges and corners of the casting blank, and the heated edges and corners of the casting blank are encapsulated in the inductor, so that a main magnetic circuit formed by the L-shaped coil winding is positioned at the edges and corners of the casting blank, thereby not only meeting the requirement of edge heating, but also realizing true edge heating, changing the idea of driving the temperature rise of the edges and corners by the middle part, avoiding the energy waste and fundamentally solving the problem of edge cracking;

3) the applicability is strong: according to the invention, the L-shaped sensors can be arranged at two corners or four corners of the casting blank according to the process requirements. The automatic detection system detects related parameters, and the transverse and longitudinal distances among the L-shaped inductors can be automatically adjusted by combining the lifting hydraulic cylinder, the multi-stage hydraulic cylinder and the telescopic hydraulic cylinder, so that casting blanks with different specifications and sizes can be efficiently and reliably heated, the specification types and the spare part quantity of the inductors are reduced, the automation requirements of modern industry are met, and the manual investment is reduced;

4) degree of automation is high, and it is convenient to maintain and overhaul: because the independent L-shaped inductor is adopted, when the heating device at the edge part breaks down or needs to be overhauled and offline, the automatic offline operation of the inductor under the working condition of not influencing the normal withdrawal and straightening of the casting blank can be realized only by starting the system overhauling mode without stopping the continuous casting line, the convenience of equipment installation and disassembly is enhanced, and the stable operation of a production plan is ensured;

5) the reliability is high: hollow copper pipes which are arranged in an S shape along the length direction of the inductor are arranged on the inner surface of the non-magnetic shell, the L-shaped coil winding is wound by the copper pipes, and low-conductivity cooling water with certain pressure is introduced into the hollow copper pipes and the L-shaped coil winding, so that the temperature of the inductor is reduced, and the inductor can reliably run under a high-temperature working condition;

6) the modularized design and pertinence are strong: according to the process requirements, aiming at the occurrence positions and conditions of specific edges and corners and edge cracks, L-shaped inductors can be installed at the corresponding edges and corners, the inductors are flexibly combined, the edge cracks are pertinently solved, and the energy consumption is reduced; meanwhile, the inductors can be flexibly assembled and added according to the specific flow number of the continuous casting line, and the device is modular in design, compact in structure and flexible to install.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

FIG. 1 is a schematic perspective view of a casting blank corner heating apparatus and a heated casting blank according to an embodiment of the present invention;

FIG. 2(a) is a general view of a system of a heating apparatus for a corner of a cast slab;

FIG. 2(b) is a schematic diagram of detection of casting blank horizontal angle by a casting blank corner heating device;

FIG. 3 is an enlarged schematic view of the structure I of FIG. 1;

FIG. 4 is a partial enlarged schematic view of a heating unit having 4 inductors according to another embodiment;

FIG. 5 is a partial schematic view of FIG. 4 from one perspective;

FIG. 6 is a partial schematic view of FIG. 4 from another perspective;

FIG. 7 is a partial schematic view of FIG. 4 from yet another perspective;

FIG. 8(a) is a schematic diagram showing the positional relationship among the movable portion of the second telescoping structure, the fourth telescoping structure, and the connecting member when the second rotating shaft is rotated to a position;

FIG. 8(b) is a schematic diagram showing the positional relationship among the movable portion of the second telescoping structure, the fourth telescoping structure, and the connecting member when the second rotating shaft is rotated to another position;

FIG. 9 is a perspective view of the connector of FIG. 1;

FIG. 10 is a schematic structural view of the first embodiment of the L-shaped inductor 1;

FIG. 11 is a schematic view of the L-shaped coil winding of FIG. 10 folded;

FIG. 12(a), FIG. 12(b), FIG. 12(c) and FIG. 12(d) are schematic structural diagrams of the 2 nd, 3 rd, 4 th and 5 th embodiments of the L-shaped inductor, respectively;

fig. 13 is a schematic diagram of the first and second coil sub-structures of fig. 12(a) -12 (d) in winding form;

FIG. 14 is a schematic structural view of an inductor in a U-shaped configuration;

FIG. 15 is a schematic diagram showing the distribution of magnetic paths in a heating apparatus for a corner of a casting slab using an L-shaped sensor as shown in FIG. 10 according to an embodiment of the present invention;

FIG. 16 is a schematic diagram of the distribution of eddy current on the surface of a casting blank by using the L-shaped sensor shown in FIG. 10 according to the embodiment of the invention;

FIG. 17 is a graph showing the temperature change of the corner portion of the cast slab in the longitudinal direction of the cast slab before and after heating by the L-shaped sensor shown in FIG. 10.

In the above drawings, 11, a first pyrometer, 12, a second pyrometer, 13, a position measuring device; 14. a speed measuring device; 4. an apparatus body; 5. a hydraulic control system; 6. a cooling system; 7. a variable frequency power supply; 8. a control system; 41. a base; 42. a movable support; 43. a telescopic adjusting mechanism; 44. a multi-stage hydraulic cylinder; 45. clamping a rail; 46. a movable part of the second telescopic structure; 47. a connecting member; 48. a fifth telescopic structure; 49. an inductor; 50. casting blanks; 492. a circular slider; 493. a first baffle plate; 494. a guide portion; 4911. a non-magnetic housing; 4912A, a first coil substructure, 4912B, a second coil substructure; 4913. a cooling duct; 4914. an iron core; 4915. an L-shaped insulating non-magnetic heat insulation plate; 495A, first magnetic force line; 495B, second magnetic force lines; 501. and (4) swirling.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

As shown in fig. 1 to 2, the present invention provides a heating device for a cast slab corner portion, preferably installed in a region after the second cooling of a continuous casting line and before the straightening.

An orthogonal cartesian coordinate system (x, y, z) is defined at any position of the casting blank corner heating device, the coordinate origin of the coordinate system is o, the oz direction is the height direction of the casting blank corner heating device, and the yoz plane is parallel to the running direction of the casting blank 50.

The casting blank corner heating device comprises a support, the size of the support is adjustable in the oz direction, K connecting pieces 47 which are hinged with the support and can rotate in the yoz plane are arranged on the support, and K is larger than or equal to 1.

As shown in fig. 1, K = 2. The two connecting pieces 47 are arranged at intervals along the ox direction;

the ith connecting piece 47 is connected with an ith heating unit for heating the edge and corner of the casting blank 50 on the ith continuous casting line, the ith connecting piece 47 drives the ith heating unit to rotate in a yoz plane, and i =1,2, … and K.

As shown in fig. 1, the support includes a first telescopic structure with an adjustable size in the oz direction, a second telescopic structure with an adjustable size in the ox direction is arranged on a movable portion of the first telescopic structure, and K connecting pieces 47 are arranged on the movable portion 46 of the second telescopic structure and hinged to the movable portion 46 of the second telescopic structure. First extending structure includes base 41, first extending structure's movable part is for setting up in base 41 top and the movable support 42 that cup joints with base 41, first extending structure still includes flexible adjustment mechanism 43 of size adjustable in the oz direction, flexible adjustment mechanism 43 both ends correspond fixed connection with base 41, movable support 42 respectively. And a limiting structure for preventing the second telescopic structure from swinging when the second telescopic structure is telescopic along the ox direction is arranged on the movable support 42. The limiting structure is preferably a clamping rail 45 arranged on two sides of the second telescopic structure. The telescoping adjustment mechanism 43 may be a jacking hydraulic cylinder.

The device body 4 is composed of a base 41, an opening automatic adjusting device and an inductor. The base 41 is formed by splicing square tubes, the lower end of the base is fixed on the ground, and the upper end of the base is sleeved with a movable support 42. The connector 47 may be a right angle trapezoidal frame. The automatic opening adjusting device consists of a movable support 42, a telescopic adjusting mechanism 43, a multi-stage hydraulic cylinder 44, a clamping rail 45, a telescopic cantilever, a connecting piece 47 and a telescopic hydraulic cylinder. The second telescopic structure comprises a multi-stage hydraulic cylinder 44 and a telescopic boom, i.e. a movable part 46 of the second telescopic structure. The movable support 42 is formed by processing a square tube smaller than the square tube of the base 41 by a specification, and the lower end of the movable support is inserted into the square tube of the base. The square tube of the movable support 42 is designed to be inserted into the square tube of the base 41, and when the square tube of the base 41 is used as a guide rail to slide up and down, the movable support 42 does not shake. The movable support 42 and the base 41 are connected through two jacking hydraulic cylinders, the lower end of the movable support is fixed on the base 41, the upper end of the movable support is fixed on the movable support 42, and the two jacking hydraulic cylinders are controlled by a hydraulic control system to complete the up-and-down movement of the movable support 42. The telescopic cantilever is made of nonmagnetic square pipes with two different specifications, the size of the square pipe with the small specification is inserted into the square pipe on the premise of ensuring enough structural strength, and the square pipe does not shake when moving as a rail in a telescopic mode. One end of the telescopic cantilever is fixed in a clamping rail 45 groove at the upper part of the movable bracket 42, and the other end of the telescopic cantilever is fixed in the groove according to the continuous casting line flow number: one or more sensors 49 are suspended in one machine or multiple machines and multiple streams, and one machine corresponds to one sensor 49. The casting blank passes through an opening in the middle of the inductor.

As shown in fig. 5-7, 8(a), 8(b), the ith heating unit includes an ith first hinge shaft 100, an ith third telescopic structure 4992, and the ith connecting member 47 is rotatable about the ith first hinge shaft 100 in the yoz plane.

Fig. 8(a) and 8(b) are schematic views of two rotation states after 1 side plate is removed. The ith first hinge shaft 100 is sleeved with a first rotating part 101 and a second rotating part 102, the first rotating part 101 and the second rotating part 102 are respectively and correspondingly and fixedly connected with the movable part 46 and the ith connecting piece 47 of the second telescopic structure, two ends of the ith third telescopic structure 4992 are respectively and correspondingly hinged with the movable part 46 and the ith connecting piece 47 of the second telescopic structure, and a triangle is formed by the pin joint of the ith third telescopic structure 4992 and the movable part 46 of the second telescopic structure, the pin joint of the ith third telescopic structure 4992 and the ith connecting piece 47, and the projection of the axis of the ith first hinge shaft 100 on the yoz plane. The movable portion 46 of the second telescopic structure is fixedly provided with a fixing plate 4991, and the fixing plate 4991 and the fixing plate 4991 are hinged to each other through a second hinge shaft 200. A fixing block 473 is fixedly disposed on the base plate 471, and the third telescopic structure 4992 and the fixing block 473 are hinged to each other through a third hinge shaft 300. The movable portion 46 of the second telescopic structure is provided on both side plates 472. When the first hinge shaft 100 is rotated to a certain position, the movable portion 46 of the second telescopic structure also acts as a limit to the connection member 47.

The relative positions of the projection of the ith first hinge shaft 100 and each L-shaped inductor in the ith heating unit on the yoz plane can be maintained constant. The third telescoping structure 4992 may be a hydraulic telescoping structure.

The ith heating unit comprises M_iAn inductor; m_iEach sensor being slidable in a direction parallel to the ox direction to slidably engage the ith link 47, or M_iThe inductor is fixedly connected with the ith connecting piece 47, M_iNot less than 1. In this embodiment, the inductor is L-shaped.

If the section size of the casting blank on the ith continuous casting line is fixed, each inductor of the corresponding heating unit can be fixedly connected with the corresponding connecting piece.

If casting blanks with different specifications need to be processed, namely the section size of the casting blank on the ith continuous casting line is changed, each inductor of the corresponding heating unit can be in sliding connection with the corresponding connecting piece 47, so that the distance between the adjacent inductors is adjusted, and the inductors are in contact with or close to the surface of the casting blank. Another advantage of the sliding connection is that if the projection of the casting blank running direction in the ox direction changes, the position of the casting blank with the position changing in the ox direction can be adapted by adjusting the positions of the two sensors arranged at intervals in the ox direction.

The inductor has a non-magnetic housing 4911, and the non-magnetic housing 4911 of the inductor of the ith heating unit has N_iA turning part, N_iNot less than 1. The opening shape of the turning part is adapted to the shape of the corner of the cross section of the casting blank 50. The non-magnetic housing may be stainless steel.

When the strand 50 on the ith strand is heated, the passage of the strand 50 passes through the ith receiving area, M_iEach turn of each inductor wraps the corner region of the casting blank 50 from the side of the channel of the casting blank 50, and the turns are in contact with the surface of the casting blank or have a certain distance.

The two walls defining the non-magnetic shell 4911 that forms the opening of the turn are the first wall 4911A and the second wall 4911B of the turn, respectively; the included angle range of the turning part is [45 degrees, 135 degrees ];

an L-shaped coil winding 4912 is arranged in the inner cavity of the non-magnetic shell 4911 at a position corresponding to each turning part;

the L-shaped coil winding 4912 comprises R1 layers of first coil substructures 4912A, R2 layers of second coil substructures 4912B, R1 layers of first coil substructures 4912A, R2 layers of second coil substructures 4912B are integrally formed into the L-shaped coil winding 4912, R1 is more than or equal to 1, and R2 is more than or equal to 1;

in the L-shaped coil winding 4912, the coil planes of each layer of the first coil sub-structure 4912A are parallel to each other and to the first plane of the L-shaped coil winding 4912, and the coil planes of each layer of the second coil sub-structure 4912B are parallel to each other and to the second plane of the L-shaped coil winding 4912;

when the L-shaped coil winding 4912 is energized, the line connecting the two magnetic poles formed by each layer of the first coil substructure 4912A is perpendicular to the first plane and the N pole is located on the same side corresponding to the S pole, and the line connecting the two magnetic poles formed by each layer of the second coil substructure 4912B is perpendicular to the second plane and the N pole is located on the same side corresponding to the S pole;

the first plane and the second plane of the L-shaped coil winding 4912 are respectively parallel to the first wall surface 4911A and the second wall surface 4911B of the corresponding turn, the L-shaped coil winding 4912 is arranged along the turn direction of the corresponding turn (i.e., the L-shaped coil winding 4912 is arranged around the corresponding turn), and the opening direction of the L-shaped coil winding 4912 is the same as the opening direction of the corresponding turn;

there is an ith third plane such that the first and second planes of each L-shaped coil winding 4912 in the ith heating unit are perpendicular to the ith third plane;

the projection shape of the ith accommodating region on the ith third plane is M_i×N_iPolygonal at each end point and has the same cross-sectional shape as the casting blank 50 on the ith casting line, and the projection area of the ith containing area on the ith third plane is not less than the cross-sectional area of the casting blank 50 on the ith casting line, M_iThe projection of the intersection line of the first wall 4911A and the corresponding second wall 4911B of each turn of the sensor on the ith third plane forms M of the polygon_i×N_iAnd (4) an end point.

In this embodiment, the included angle of the turning part is 90 °.

An iron core 4914 is further accommodated in the inner cavity of the non-magnetic shell 4911, the iron core 4914 and the wall surface of the non-magnetic shell 4911 enclose L-shaped cavities, the number of which is the same as that of the turns of the non-magnetic shell 4911, included angles between the L-shaped cavities and the corresponding turns are the same, and the L-shaped cavities are arranged close to the openings of the corresponding turns and accommodate corresponding L-shaped coil windings 4912.

The inductor comprises a non-magnetic shell 4911, a first coil substructure 4912A, a second coil substructure 4912B, a hollow copper tube 4813, an iron core 4914, and an L-shaped insulating non-magnetic thermal shield 4915. An L-shaped insulating non-magnetic thermal baffle 4915 is disposed between the L-shaped coil winding 4912 and the first and second wall surfaces 4911A and 4911B of the corresponding turn.

The iron core 4914 is formed by laminating and splicing silicon steel sheets, so that eddy current loss and hysteresis loss inside the iron core under alternating current excitation can be effectively reduced, and the energy utilization rate is improved. The core 4914 may be formed of two L-shaped structures, wherein one wall of one L-shaped structure and one wall of the other L-shaped structure are parallel to the first wall and the second wall, respectively, and the other wall of one L-shaped structure is located between the one wall of the one L-shaped structure and the first wall, and the other wall of the other L-shaped structure is located between the one wall of the other L-shaped structure and the second wall.

The first coil substructure 4912A and the second coil substructure 4912B are L-shaped wound with a hollow red copper tube and fixed in a cavity formed by splicing the iron core 4914, and the cavity has an opening facing the heated casting blank. Because the opening of the cavity faces the heated casting blank 50, the gap between the L-shaped core 4914 and the casting blank 50 is greatly reduced, which is beneficial for the first magnetic line of force 495A generated by the first coil substructure 4912A and the second coil substructure 4912B in the cavity to pass through the casting blank 50, so as to form a main magnetic path inside the casting blank 50, and effectively reduce the loss of air leakage and magnetic energy in the air gap.

The iron core 4914 and the first and second wall surfaces 4911A and 4911B of the turn portion define an L-shaped cavity corresponding to the turn portion. Because the first wall surface 4911A and the second wall surface 4911B contact two adjacent surfaces of the casting blank, and the iron core, the first wall surface 4911A and the second wall surface 4911B enclose an L-shaped cavity for accommodating an L-shaped coil winding, magnetic leakage can be prevented.

One form of L-shaped coil winding is shown in fig. 10-11: r1= R2, the first R-layer coil substructure 4912A and the second R-layer coil substructure 4912B are formed by folding an R-th multi-turn spiral coil wound on a plane in half, the first R-layer coil substructure 4912A and the second R-layer coil substructure 4912B are two parts of an R-th multi-turn spiral coil divided by a folding line, the first R-layer coil substructure 4912A and the second R-layer coil substructure 4912B form an R-th coil unit in an L shape, the R + 1-th coil unit in the L shape is disposed on the side of the R-th coil unit in the L shape away from the opening, the coil units are sequentially stacked to form the L-shaped coil winding 4912, two adjacent coil units are connected in series, the winding directions of the coil units are the same, R =1, … …, and R1-1. The first coil substructure 4912A and the second coil substructure 4912B are wound and then embedded in the core 4914. The coil is similar to a concentric helix structure and is folded at 90 degrees in the diameter direction after being wound. The coil is embedded in the groove on one side of the iron core. The structure of the coil when wound is shown in fig. 11, and after the winding is finished, the coil is folded along the center line (folding line) to 90 degrees.

As shown in fig. 15, by using an L-shaped non-magnetic shell 4911, an iron core 4914, and an L-shaped coil winding 4912, the corners of the heated casting blank 50 are encapsulated inside the L-shaped non-magnetic shell 4911, so that the first magnetic lines of force 495A generated by the first coil substructure 4912A and the second coil substructure 4912B are located at the corners of the casting blank, thereby achieving the purpose of actually heating the corners of the casting blank. Meanwhile, for the casting blank 50 with large length-width ratio, the heat dissipation of the narrow side is also fast, the heating of the edge part can be met by arranging L-shaped inductors at the two corners of the narrow side of the casting blank, meanwhile, the edge part can also be heated, and the application range of the equipment is expanded. The cast slab 50 shown in fig. 15 is a slab cross section.

The L-shaped insulating non-magnetic thermal baffle 4915 is made of a special ceramic material that is insulating, has a certain structural strength, good high temperature performance, high temperature resistance, non-magnetic conductivity, and permeable to magnetic lines of force. An L-shaped insulating non-magnetic heat insulating plate 4915 is disposed on the inner surfaces of the first coil substructure 4912A and the second coil substructure 4912B, so that strong heat radiation of a hot cast slab to the first coil substructure 4912A and the second coil substructure 4912B can be effectively isolated by good heat insulation. In addition, cooling channels 4913 are disposed on the inner surface of the non-magnetic housing 4911 in an "S" configuration along the length of the inductor. The copper pipes of the first coil substructure 4912A and the second coil substructure 4912B and the cooling pipeline 4913 on the inner surface of the non-magnetic shell are internally filled with low-conductivity cooling water with the pressure of 0.3MPa-0.4MPa provided by a cooling system. By the flow of the cooling water, radiant heat generated by the cast slab to the first coil substructure 4912A, the second coil substructure 4912B, and the nonmagnetic shell 4911, and heat generated by self-heating of the first coil substructure 4912A and the second coil substructure 4912B are carried away.

Under the combined action of the L-shaped insulating non-magnetic thermal insulation board 4915 and the copper pipe cooling water, the temperatures of the first coil substructure 4912A and the second coil substructure 4912B are effectively controlled, energy waste caused by temperature rise of the first coil substructure 4912A and the second coil substructure 4912B is reduced, burning of the first coil substructure 4912A and the second coil substructure 4912B due to high temperature rise is avoided, and reliability and stability of the equipment under a high-temperature working condition are improved.

Fig. 12(a) to 12(d) and 13 show another form of L-shaped coil winding: each layer of the first coil substructure 4912A and each layer of the second coil substructure 4912B are spiral coils wound on a plane; two adjacent layers of the first coil substructures 4912A are connected in series, two adjacent layers of the second coil substructures 4912B are connected in series, the winding directions of the first coil substructures 4912A are the same, and the winding directions of the second coil substructures 4912B are the same. In a preferred embodiment, the structure of R1 layers of the first coil substructure 4912A and the structure of R2 layers of the second coil substructure 4912B are connected in parallel or in series with each other. In fig. 12(B), the magnetic lines of force generated by the L-shaped coil winding are identified as second magnetic lines of force 495B.

The multi-turn helical coil may be a concentric helical coil.

The non-magnetic shell 4911 of each inductor of the heating unit may have an L-shaped configuration with 1 turn, as shown in the embodiments of FIGS. 1, 3, and 4-7, wherein the number of turns N_i= 1; the non-magnetic shell 4911 of each inductor of the heating unit may also be a U-shaped structure with 2 turns, the opening of the U-shaped structure facing in a direction parallel to the ox direction or the second direction, the opening of the U-shaped structure forming a receiving area, as shown in fig. 14, where the opening of the U-shaped structure facing in a direction parallel to the second direction, where N is the number of turns_i= 2; the non-magnetic shells 4911 of each inductor of the heating unit may also be a zigzag structure with 4 turns, the zigzag structure opening forming a containment area.

As shown in fig. 3 and 9, M_S1=2, two

inductors

49A, 49B of the S1 th heating unit are oppositely arranged in the ox direction, SThe 1 link 47 is fixedly connected with a guide portion 494 extending in a direction parallel to the ox direction, and the two

sensors

49A, 49B are respectively slidably connected with the guide portion 494.

The S1 th connecting piece 47 has a base plate 471, two side plates 472 fixedly disposed on the base plate 471, the two side plates 472 are disposed opposite to each other and parallel to the yoz plane, the casting blank corner heating device further includes two first baffles 493 respectively fixed to the two

inductors

49A, 49B, the two first baffles 493 are respectively disposed opposite to the two side plates 472 in a direction parallel to the ox direction, and a fifth telescopic structure 48 which is telescopic in a direction parallel to the ox direction is disposed between each first baffle 493 and the corresponding side plate 472; n is a radical of_S1The first wall surfaces of the turns are all parallel to the surface of the substrate 471. The fifth telescoping structure 48 may be a telescoping hydraulic cylinder.

As shown in fig. 3, the inductor is supported by support rollers distributed in front of and behind the inductor. According to the requirements of the continuous casting process, if only two corners of the upper surface of the casting blank 50 are cracked, only one L-shaped sensor needs to be respectively installed at the two corners of the upper surface; if cracks appear on the four corners of the upper surface and the lower surface of the casting blank, all L-shaped sensors are required to be installed at the four corners. The L-shaped inductors are hung at two ends of the same side of the two guide rails 494 through a circular slider 492 clamped between the two guide rails 494, a connecting piece 47 is fixed at the other side of the guide rails 494, and the two L-shaped inductors are hung below the small-specification square tube of the telescopic cantilever through the connecting piece 47. The right trapezoid frame is adopted to adjust the sensor to be parallel to the casting blank, and only one bevel edge of the right trapezoid frame needs to be adjusted. The connecting piece 47 is arranged to facilitate the installation of the guide rail 494 and to enable the guide rail and the inductor hung on the guide rail to be parallel to the casting blank. During adjustment, namely, one end of the right-angle trapezoid frame adopts a pin shaft, so that the right-angle trapezoid frame is convenient to rotate, and the other end of the right-angle trapezoid frame adopts a hydraulic cylinder to push and pull, so that the right-angle trapezoid frame rotates around the pin shaft.

By adjusting the inclination angle of the substrate 471, it can be ensured that the two right-angle surfaces of the L-shaped inductor and the two planes of the heated corner of the casting blank 50 are kept parallel, and the gap between the two surfaces is kept consistent.

Be equipped with first baffle 493 in L type inductor side, the position between two guide rails 494 of correspondence, be equipped with flexible pneumatic cylinder between first baffle 493 and connecting piece 47 for adjust the distance between L type inductor and the connecting piece 47, distance between two L type inductors promptly, so that the inductor can be suitable for different specification casting blanks 50 and heat, improves the commonality of inductor, reduces spare parts volume. The upper edge of the connecting element 47 is fixed to the bottom of the movable part of the second telescopic structure.

As shown in fig. 4-7, M_S1=4, in the S1 th heating unit, two

other sensors

49C, 49D are oppositely arranged in the ox direction, and two

other sensors

49C, 49D are oppositely arranged with the two

sensors

49A, 49B in the S1 th second direction, respectively; more preferably, the two

other sensors

49C and 49D are respectively connected with the guiding portion 494 in a sliding manner, or the two

other sensors

49C and 49D are respectively connected with the two

sensors

49A and 49B in a corresponding fixed manner, or the two

other sensors

49C and 49D are respectively connected with the two

sensors

49A and 49B in a corresponding manner through two fourth telescopic structures 497, and the length direction of the fourth telescopic structure 497 is parallel to the S1 th second direction. The fourth telescoping structure 497 may be a hydraulic telescoping structure. Two second baffles 496 may be respectively fixed to the

sensors

49C and 49D, and two ends of the fourth telescopic structure 497 are respectively and fixedly connected to the two second baffles 496.

As shown in fig. 2(a), the casting blank corner heating device includes a variable frequency power supply 7, an apparatus body 4, a monitoring system, a cooling system 6, a control system 8, and a hydraulic control system 5. The variable frequency power supply 7 supplies power to the equipment body. The variable frequency power supply 7 may be multiplexed, i.e. the variable frequency power supply 7 supplies power to each heating unit. The control system may be a PLC control system. The control system can be realized by a single data processing center and a single control system, and can also integrate the functions of data processing and control. The casting blank corner heating device further comprises an angle measuring device used for measuring an included angle between the running direction of the casting blank 50 on the ith casting line and an xoy plane, a speed measuring device 14 used for measuring the moving speed of the casting blank 50 on the ith casting line, and a position measuring device 13 used for measuring the coordinate of the casting blank 50 on the ith casting line in a coordinate system (x, y, z), wherein a control part of a first telescopic structure, a control part of a second telescopic structure and a rotation control part of the ith connecting piece 47 are electrically connected with the control system 8, and the position measuring device 13 and the speed measuring device 14 corresponding to the casting blank 50 on the ith casting line are both arranged at the position which is d1 away from the inlet of the containing area in the ith first direction. d1 can be determined according to the first telescopic structure, the second telescopic structure, the time required for the i-th connecting piece 47 to rotate and the running speed of the casting blank, and can be understood by a person skilled in the art.

The openings of the two ends of the ith containing area in the ith first direction are defined as an ith containing area inlet and an ith containing area outlet respectively, the casting blank corner heating device further comprises a first pyrometer 11 used for measuring the temperature of the casting blank 50 positioned at the containing area inlet and a second pyrometer 12 used for measuring the temperature of the casting blank 50 positioned at the containing area outlet, and the power supply control end (namely, the variable frequency power supply 7) of each heating unit is electrically connected with the control system 8.

The monitoring system comprises a first pyrometer 11, a second pyrometer 12, a position measuring device 13, a speed measuring device 14 and a control system 8.

The first pyrometer 11 and the second pyrometer 12 are respectively arranged at an inlet and an outlet of the inductor and used for monitoring the temperature of the casting blank before and after heating in real time. The position measuring device 13 and the speed measuring device 14 are arranged at a distance from the sensor strand inlet. Position measuring devices 13 can be respectively arranged at positions with certain distances from the upper plane, the lower plane, the left plane and the right plane of the casting blank and used for detecting parameters of the casting blank to be heated. The coordinates of the 4 position measuring devices 13 in the oxyz coordinate system are known, i.e. the distance between the two position measuring devices 13 above and below the cast strand in the ox direction, and the distance between the two position measuring devices 13 on both sides of the cast strand in the second direction are known. The size of the casting blank in the ox direction is obtained by measuring the distance between 4 position measuring devices 13 and the casting blank, subtracting the sum of the distances between the two position measuring devices 13 in the ox direction and the casting blank from the distance between the two position measuring devices 13 in the ox direction to obtain the size of the casting blank in the ox direction, and subtracting the distance between the two position measuring devices 13 in the second direction from the distance between the two position measuring devices 13 in the second directionAnd the sum of the distances between the position measuring device 13 and the casting blank is used for obtaining the size of the casting blank in the second direction, namely the coordinates of the casting blank and the section size of the casting blank. The position measuring device 13 may employ a high temperature resistant laser ranging sensor. The speed measuring device 14 is provided with a sensor arranged at a distance from the upper surface of the cast slab for detecting the moving speed of the cast slab. The temperature, casting blank coordinate parameters and casting blank moving speed signals obtained by the monitoring equipment are transmitted to a control system 8 through a high-temperature resistant signal cable; and the control system 8 obtains the position of the casting blank to be heated relative to the inductor and the specification and size parameters of the casting blank according to the coordinate parameters, and controls the whole system. The speed measuring device 14 may be a velose DL laser velocimeter. The position measurement device 13 may employ a ZLDS11X high temperature laser ranging sensor. As shown in fig. 2(b), the angle measuring device can be implemented by two laser

distance measuring sensors

132 and 133 spaced in the running direction of the casting slab 50, that is, the difference between the distances from the laser distance measuring sensor 132 and the laser distance measuring sensor 132 to the surface of the casting slab 50 and the known distance between the two laser

distance measuring sensors

132 and 133 can be solved according to the arctangent function to obtain the included angle between the running direction of the casting slab 50 and the xoy planeα. The

laser range sensors

132 and 133 may employ ZLDS11X high temperature laser range sensors. The laser

distance measuring sensors

131, 132 and 133 can also be used as position measuring devices, i.e. the position measuring devices and the angle measuring devices can be integrated.

The present invention also provides a method for heating a casting blank corner portion using the apparatus for heating a casting blank corner portion, characterized in that: the method for heating the corner part of the casting blank comprises the following steps:

(A) before the casting blank 50 on the ith continuous casting line reaches the inlet of the ith containing area, measuring an included angle between the running direction of the casting blank 50 and an xoy plane, and the coordinate of the casting blank 50 in a coordinate system (x, y, z), adjusting the size of a bracket in the oz direction and the rotation angle of the ith connecting piece 47 according to the included angle between the running direction of the casting blank 50 and the xoy plane and the coordinate of the casting blank 50 in the coordinate system (x, y, z), so that the projection area of the casting blank 50 on the ith third plane is equal to the section area of the casting blank 50, and the projection of the casting blank 50 on the ith third plane does not exceed the projection range of the ith containing area on the third plane;

(B) heating a casting blank 50 on the ith continuous casting line by using the ith heating unit;

preferably, the step (a) further comprises: before the casting block 50 on the ith continuous casting line reaches the entrance of the ith receiving area, the sectional size of the casting block 50 is measured, and M is adjusted according to the sectional size of the casting block 50_iThe distance between adjacent ones of the inductors;

preferably, the support comprises a first telescopic structure with adjustable size in the oz direction, a second telescopic structure with adjustable size in the ox direction is arranged on a movable part of the first telescopic structure, and K connecting pieces 47 are arranged on a movable part 46 of the second telescopic structure and hinged with the movable part 46 of the second telescopic structure; the step (a) further comprises: before the casting blank 50 on the ith continuous casting line reaches the entrance of the ith containing area, the telescopic length of the second telescopic structure is adjusted according to the coordinates of the casting blank 50 in a coordinate system (x, y, z);

preferably, the step (B) further comprises: and adjusting the power supply of the ith heating unit according to the target heating temperature of the casting blank 50 on the ith continuous casting line and the temperatures of the casting blank 50 at the inlet position and the outlet position of the ith containing area.

If the temperature difference between the inlet position and the outlet position is larger, the temperature required to be increased by the casting blank is also higher, and the power supply power of the heating unit is increased, namely the power supply power for supplying power to the coil is increased. If the outlet position is higher than the target heating temperature, the power supply of the heating unit may be reduced.

The working process and heating principle of the online multi-specification casting blank corner heating system are described by taking an inductor composed of two L-shaped inductors 49A and 49B as an example: when the casting blank 50 moves to the position measuring device 13, the speed measuring device 14 and the inlet pyrometer 1 which are positioned at a certain distance away from the sensor of the corner heating device, the sensors start to detect the coordinate parameters, the moving speed and the inlet temperature of the casting blank, the detection results are transmitted to the control system 8 through a high-temperature resistant signal cable, and the specification and the size of the casting blank and the relative position parameters of the casting blank and the sensor are obtained after the control system 8 processes the data; the control system 8 adjusts the overall position of the inductor, the opening size (accommodating area size) of the inductor and the relative positions of the two L-shaped inductors 49A and 49B through the automatic opening adjusting device according to the position parameters and the specification and size parameters of the casting blank, so that the inductors move to the positions corresponding to the position 50 of the casting blank, the opening size of the inductors is matched with the casting blank to be heated, and the automatic opening adjusting operation of the inductors according to the width of the casting blank is completed. When the opening is adjusted, the distances between the L-shaped inductor and the casting blank 50 from top to bottom, left to right and from 30mm are taken as the standard: if the gap is too large, the air gap has larger magnetic resistance and low energy utilization rate, so that energy waste is caused; if the casting blank is too small, the casting blank cannot smoothly pass through the inductor, so that the casting blank can collide with the inductor to damage the inductor; on the other hand, as the system is switched into the corresponding casting blank heating working state from the standby state, a certain time is required, and therefore, an effective speed signal is used as a system starting signal (a blank coming signal); in addition, as the specification of the casting blank is larger, the heat loss of the edge part is more serious, the difference between the temperature of the edge part and the central temperature is larger, and the temperature required to be increased by the edge part is higher; the faster the casting blank moves, the shorter the time of the casting blank passing through the inductor is, and the shorter the time of the casting blank heating in the inductor is, the faster the temperature rise rate of the casting blank is required; meanwhile, the larger the temperature difference between the inlet and the outlet, the higher the temperature of the casting blank to be raised. By combining the specification and size parameters and the initial temperature of the casting blank, the PLC control system adjusts the electric parameters such as the current and the frequency applied to the first coil substructure 4912A and the second coil substructure 4912B by the variable frequency power supply 7 through the parameters of the casting blank, so that the heating power output by the power supply is matched with the distribution condition of the initial temperature of the casting blank, and the dynamic regulation of the output power of the power supply along with the initial condition of the casting blank is realized. After the adjustment is completed, the variable frequency power supply system applies a current with a certain frequency to the first coil substructure 4912A and the second coil substructure 4912B, the energized first coil substructure 4912A and the energized second coil substructure 4912B generate an alternating magnetic field changing at the same frequency, and the alternating magnetic field passes through the edge and two planes of the casting blank 50 to generate an eddy current 501 at the edge of the casting blank 50, as shown in fig. 16. The eddy current 501 loss is converted into heat energy, and the corners of the casting blank 50 are heated. The casting blank 50 passes through the inductor and then completes the heating of the corner part, the temperature of the casting blank 50 is detected by the pyrometer 1 at the outlet to obtain a temperature parameter, and the detected temperature is compared with a target temperature: if the temperature is lower, the output power of the power supply is increased through the control system 8; otherwise, the output power of the power supply is reduced, and unnecessary energy waste is avoided. And continuously adjusting parameters through temperature feedback, and finally adjusting the electrical parameters to a value corresponding to the target temperature to complete the heating of the system on the edges and corners of the multi-specification casting blank.

When the heating device at the edge part breaks down or needs to be overhauled off-line, the continuous casting line is not needed to be stopped, only the system overhauling mode needs to be started, the system can automatically disconnect the power supplies of the first coil substructure 4912A and the second coil substructure 4912B of the heating device at the edge part, and control the two telescopic hydraulic cylinders through the control system, so that the inductor is far away from the casting blank 50 for a certain distance, then the two jacking hydraulic cylinders and the multi-stage hydraulic cylinders 44 are controlled to enable the inductor to be far away from the continuous casting line, and finally, the automatic off-line operation of the inductor under the condition that the normal withdrawal and straightening of the.

The invention utilizes the electromagnetic induction heating technology to adjust the relative position between the inductors, and realizes the following effects on casting blanks with different specifications: the method comprises the steps of quickly and efficiently heating the edge parts and the real corner parts of the line on a plate blank, a square blank and a rectangular blank; meanwhile, the equipment can be automatically offline for maintenance at any time on the premise of not influencing normal production, the automation degree is high, the reliability is high, the maintenance is convenient, and the stable operation of a production plan is ensured.

The main heating object of the system is the corner part, so that the problem caused by the difference between the temperature of the corner part and the temperature of the center is solved; however, for a billet with a smaller cross-sectional dimension, the system can heat the corners and the central area directly or through heat conduction from the corners.

As shown in FIG. 17, the casting heating device of the present application was placed at a position selected from the length direction of the casting, i.e., at a position of y-coordinate of 500-. To a certain specification casting blank 50, when not adopting the casting blank heating device of this application, casting blank edges and corners temperature is about 800 ℃, and after the casting blank heating device of this application (edges and corners heating device), with casting blank edges and corners temperature from 800 ℃ the time, promote to being close 1150 ℃, its effect is very showing, can satisfy the continuous casting technological requirement completely, has effectively avoided the production of edges and corners crack. Meanwhile, compared with a continuous casting line without the corner heating device, the continuous casting line adopting the corner heating device can save the production cost of the subsequent process by about 70-80%. As shown in fig. 15, the cast slab 50 has 4 corners, and it can be found in the experiment that when only two L-shaped sensors are provided at the upper two corners, the upper two corners have higher temperature, and the lower two corners have lower temperature because no L-shaped sensor is provided.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent. After reading this disclosure, modifications of various equivalent forms of the present invention by those skilled in the art will fall within the scope of the present application, as defined in the appended claims. The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

Claims

1. A casting blank corner heating device defines an orthogonal Cartesian coordinate system (x, y, z) at any position of the casting blank corner heating device, the origin of the coordinate system is o, the oz direction is the height direction of the casting blank corner heating device, and the yoz plane is parallel to the running direction of a casting blank (50);

the method is characterized in that: the casting blank corner heating device comprises a support, the size of the support is adjustable in the oz direction, K connecting pieces (47) which are hinged with the support and can rotate in a yoz plane are arranged on the support, and K is larger than or equal to 1;

when K is more than or equal to 2, K connecting pieces (47) are arranged at intervals along the ox direction;

the ith connecting piece (47) is connected with an ith heating unit for heating the edge and corner of a casting blank (50) on the ith continuous casting line, the ith connecting piece (47) drives the ith heating unit to rotate in a yoz plane, and i =1,2, … and K;

the support includes the first extending structure of size adjustable in the oz direction, be provided with the second extending structure of size adjustable in ox direction on the movable part of first extending structure, K connecting piece (47) set up on movable part (46) of second extending structure and articulated with movable part (46) of second extending structure.

2. The apparatus according to claim 1, wherein: the first telescopic structure comprises a base (41), a movable part of the first telescopic structure is a movable support (42) which is arranged above the base (41) and is sleeved with the base (41), the first telescopic structure further comprises a telescopic adjusting mechanism (43) with adjustable size in the oz direction, and two ends of the telescopic adjusting mechanism (43) are respectively and correspondingly and fixedly connected with the base (41) and the movable support (42);

preferably, the movable support (42) is provided with a limiting structure for preventing the second telescopic structure from swinging when being telescopic along the ox direction.

3. The apparatus according to claim 1, wherein: the ith heating unit comprises an ith first articulated shaft (100) and an ith third telescopic structure (4992), and the ith connecting piece (47) can rotate around the ith first articulated shaft (100) in a yoz plane;

the ith first hinge shaft (100) is sleeved with a first rotating part (101) and a second rotating part (102), the first rotating part (101) and the second rotating part (102) are respectively and correspondingly and fixedly connected with the movable part (46) and the ith connecting piece (47) of the second telescopic structure, two ends of the ith third telescopic structure (4992) are respectively and correspondingly hinged with the movable part (46) and the ith connecting piece (47) of the second telescopic structure, and a triangle is formed by the hinged point of the ith third telescopic structure (4992) and the movable part (46) of the second telescopic structure, the hinged point of the ith third telescopic structure (4992) and the ith connecting piece (47) and the projection of the axis of the ith first hinge shaft (100) on the yoz plane.

4. The apparatus according to any one of claims 1 to 3, wherein: the ith heating unit comprises M_iAn inductor;

M_ieach sensor being slidable in a direction parallel to the ox direction to slidably engage with the ith link (47), or M_iEach inductor is fixedly connected with the ith connecting piece (47);

the inductor has a non-magnetic housing (4911), and the non-magnetic housing (4911) of the inductor of the ith heating unit has N_iA turning part, M_i≥1，N_i1, defining two walls of a non-magnetic shell (4911) forming the opening of the turn as a first wall (4911A) and a second wall (4911B) of the turn, respectively; the included angle of the turning part is [45 degrees ], 135 degrees DEG]；

An L-shaped coil winding (4912) is arranged in the inner cavity of the non-magnetic shell (4911) corresponding to each turning part;

the L-shaped coil winding (4912) comprises R1 layers of first coil substructures (4912A) and R2 layers of second coil substructures (4912B), the R1 layers of first coil substructures (4912A) and the R2 layers of second coil substructures (4912B) are integrally formed into the L-shaped coil winding (4912), R1 is more than or equal to 1, and R2 is more than or equal to 1;

in the L-shaped coil winding (4912), the coil planes of each layer of the first coil sub-structure (4912A) are parallel to each other and to the first plane of the L-shaped coil winding (4912), and the coil planes of each layer of the second coil sub-structure (4912B) are parallel to each other and to the second plane of the L-shaped coil winding (4912);

when the L-shaped coil winding (4912) is electrified, connecting lines of two magnetic poles formed by each layer of the first coil sub-structure (4912A) are perpendicular to the first plane, and N poles are positioned on the same side corresponding to S poles, connecting lines of two magnetic poles formed by each layer of the second coil sub-structure (4912B) are perpendicular to the second plane, and N poles are positioned on the same side corresponding to S poles;

the first plane and the second plane of the L-shaped coil winding (4912) are respectively parallel to the first wall surface (4911A) and the second wall surface (4911B) of the corresponding turning part, the L-shaped coil winding (4912) is arranged along the turning direction of the corresponding turning part, and the opening direction of the L-shaped coil winding (4912) is the same as the opening direction of the corresponding turning part;

there is an ith third plane such that the first plane, the second plane of each L-shaped coil winding (4912) in the ith heating unit are both perpendicular to the ith third plane;

the projection shape of the ith accommodating region on the ith third plane is M_i×N_iThe end points are polygonal and have the same cross section shape as the casting blank (50) on the ith casting line, and the projection area of the ith containing area on the ith third plane is not less than the cross section area of the casting blank (50) on the ith casting line, M_iThe projection of the intersection line of the first wall surface (4911A) and the corresponding second wall surface (4911B) of each turn of the inductor on the ith third plane forms M of the polygon_i×N_iAn endpoint;

preferably, the angle of the turn is 90 °.

5. The apparatus according to claim 4, wherein: an iron core (4914) is also accommodated in the inner cavity of the non-magnetic shell (4911), the iron core (4914) and the wall surface of the non-magnetic shell (4911) enclose L-shaped cavities with the same number as the turning parts of the non-magnetic shell (4911), the included angles of the L-shaped cavities and the corresponding turning parts are the same, and the L-shaped cavities are arranged close to the openings of the corresponding turning parts and accommodate corresponding L-shaped coil windings (4912);

preferably, the iron core (4914) and the first wall surface (4911A) and the second wall surface (4911B) of the turn portion enclose an L-shaped cavity corresponding to the turn portion.

6. The apparatus according to claim 4, wherein: the bracket comprises a first telescopic structure with adjustable size in the oz direction, a second telescopic structure with adjustable size in the ox direction is arranged on a movable part of the first telescopic structure, and K connecting pieces (47) are arranged on a movable part (46) of the second telescopic structure and hinged with the movable part (46) of the second telescopic structure;

the casting blank corner heating device further comprises a control system (8), an angle measuring device for measuring an included angle between the running direction of a casting blank (50) on an ith casting line and an xoy plane, a speed measuring device (14) for measuring the moving speed of the casting blank (50) on the ith casting line, and a position measuring device for measuring the position of the casting blank (50) on the ith casting line in a coordinate system (x, y, z), wherein a control part of a first telescopic structure, a control part of a second telescopic structure and a rotation control part of an ith connecting piece (47) are all electrically connected with the control system (8), and a position measuring device (13) and a speed measuring device (14) which correspond to the casting blank (50) on the ith casting line are all arranged at positions which are d1 away from an inlet of a containing area in the ith first direction;

preferably, the openings of the two ends of the ith containing area in the ith first direction are respectively an ith containing area inlet and an ith containing area outlet, the casting blank corner heating device further comprises a first pyrometer (11) used for measuring the temperature of the casting blank (50) positioned at the containing area inlet, a second pyrometer (12) used for measuring the temperature of the casting blank (50) positioned at the containing area outlet, and the power supply control ends of all the heating units are electrically connected with the control system (8).

7. The apparatus according to claim 4, wherein: r1= R2, the first R-layer coil substructure (4912A) and the second R-layer coil substructure (4912B) are formed by folding an R-th multi-turn spiral coil wound on a plane in half, the first R-layer coil substructure (4912A) and the second R-layer coil substructure (4912B) are two parts of the R-th multi-turn spiral coil divided by a folding line, the first R-layer coil substructure (4912A) and the second R-layer coil substructure (4912B) form an R-th coil unit in an L shape as a whole, the R + 1-th L-shaped coil unit is arranged on the side of the R-th L-shaped coil unit far away from the opening, the coil units are stacked to form the L-shaped coil winding (4912), two adjacent coil units are connected in series, the winding directions of the coil units are the same, R =1, … …, and R1-1; or

Each layer of the first coil substructure (4912A) and each layer of the second coil substructure (4912B) are spiral coils wound on a plane;

the adjacent two layers of first coil substructures (4912A) are connected in series, the adjacent two layers of second coil substructures (4912B) are connected in series, the winding directions of the first coil substructures (4912A) of each layer are the same, and the winding directions of the second coil substructures (4912B) of each layer are the same; preferably, the R1 layer first coil sub-structure (4912A) and the R2 layer second coil sub-structure (4912B) are connected in parallel or in series with each other.

8. The apparatus according to claim 4, wherein: at least the integer S1 exists such that M_S1The number of the S1 is more than or equal to 2, and the number of S1 is more than or equal to 1 and less than or equal to K, and the non-magnetic shell (4911) of each inductor of each S1 heating unit is of an L-shaped structure with 1 turning part; and/or

At least the integer S2 exists such that M_S2More than or equal to 1, more than or equal to S2, and more than or equal to K, wherein the non-magnetic shell (4911) of each inductor of the S2 th heating unit is of a U-shaped structure with 2 turning parts, and the U-shaped structure is a U-shaped structureThe orientation direction of the structure opening is parallel to the ox direction or the S2 second direction, and the U-shaped structure opening forms S2 containing areas; and/or

At least the integer S3 exists such that M_S3The number of the non-magnetic shells (4911) of each inductor of the S3 heating units is not less than 1, not less than 1 and not less than S3 and not more than K, each non-magnetic shell (4911) of each inductor of the S3 heating units is of a zigzag structure with 4 turning parts, and an opening of the zigzag structure forms an S3 accommodating area.

9. The apparatus according to claim 8, wherein: two inductors (49A, 49B) of the S1 th heating unit are oppositely arranged in the ox direction, a guide part (494) extending along the direction parallel to the ox direction is fixedly connected with the S1 th connecting piece (47), and the two inductors (49A, 49B) are respectively connected with the guide part (494) in a sliding way;

preferably, the S1 th connecting piece (47) has a base plate (471), two side plates (472) fixedly arranged on the base plate (471), the two side plates (472) are arranged oppositely and parallel to the yoz plane, the casting blank corner heating device further includes two first baffle plates (493) respectively fixed with the two inductors (49A, 49B), the two first baffle plates (493) are respectively arranged oppositely and correspondingly with the two side plates (472) in the direction parallel to the ox direction, and a fifth telescopic structure (48) which is telescopic in the direction parallel to the ox direction is arranged between each first baffle plate (493) and the corresponding side plate (472); more preferably, N_S1The first wall surfaces of the turning parts are all parallel to the surface of the substrate (471);

preferably, M_S1=4, of the S1 th heating units, two other inductors (49C, 49D) are oppositely arranged in the ox direction, and the two other inductors (49C, 49D) are oppositely arranged with the two of the inductors (49A, 49B) in the S1 th second direction respectively; more preferably, the two other sensors (49C, 49D) are respectively connected with the guide part (494) in a sliding manner, or the two other sensors (49C, 49D) are respectively connected with the two sensors (49A, 49B) in a corresponding fixed manner, or the two other sensors are respectively connected with the two sensors (49A, 49B) in a corresponding fixed manner(49C, 49D) are correspondingly connected with the two sensors (49A, 49B) through two fourth telescopic structures (497), and the length direction of the fourth telescopic structure (497) is parallel to the S1 second direction.

10. A method of heating a billet corner using the billet corner heating apparatus according to claim 1, characterized in that: the method for heating the corner part of the casting blank comprises the following steps:

(A) before the casting blank (50) on the ith continuous casting line reaches the inlet of the ith containing area, measuring an included angle between the running direction of the casting blank (50) and an xoy plane, adjusting the size of a bracket in the oz direction and the rotation angle of the ith connecting piece (47) according to the included angle between the running direction of the casting blank (50) and the xoy plane and the coordinate of the casting blank (50) in the coordinate system (x, y, z), so that the projection area of the casting blank (50) on the ith third plane is equal to the section area of the casting blank (50), and the projection area of the casting blank (50) on the ith third plane is not more than the projection range of the ith containing area on the ith third plane;

(B) heating a casting blank (50) on an ith continuous casting line by using an ith heating unit;

preferably, the step (a) further comprises: before the casting blank (50) on the ith continuous casting line reaches the inlet of the ith containing area, the section size of the casting blank (50) is measured, and M is adjusted according to the section size of the casting blank (50)_iThe distance between adjacent ones of the inductors;

preferably, the bracket comprises a first telescopic structure with adjustable size in the oz direction, a second telescopic structure with adjustable size in the ox direction is arranged on a movable part of the first telescopic structure, and K connecting pieces (47) are arranged on a movable part (46) of the second telescopic structure and hinged with the movable part (46) of the second telescopic structure; the step (a) further comprises: before a casting blank (50) on the ith continuous casting line reaches the entrance of the ith containing area, adjusting the telescopic length of the second telescopic structure according to the coordinate of the casting blank (50) in a coordinate system (x, y, z);

preferably, the step (B) further comprises: the power supply of the ith heating unit is adjusted according to the target heating temperature of the casting blank (50) on the ith casting line, the temperature of the casting blank (50) at the inlet position and the outlet position of the ith containing area.